Mobile measuring system Mechanical-optical hole-drilling equipment Single-step or multiple-step (minimum depth 0.01 mm) hole-drilling equipment (depending on expected development of residual stresses) Measurement of released deformations during drilling at individual depths, measurement of released deformations to evaluate residual stresses according to methods: ASTM E837-08 standard (uniform stress), ASTM E837-08 standard (non-uniform stress), integral method, Kockelmann method
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